# Math Help - quick quesiton

1. ## quick quesiton

$sin^2(3t)+cos^2(3t) = 1 ?$

2. Originally Posted by zpwnchen
$sin^2(3t)+cos^2(3t) = 1 ?$
Yes. (It's nothng more than the Pythagorean Identity).

3. ## Re: quick quesiton

you have to remember only one thing

sin^2 x + cos^2 x = 1

you can replace by anything like 2x, 3x, Q, 2Q etc....It will always give you 1